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Efficiency Mod

Looking to put together an RT/X-Valve mag and read a bit on Hill's efficiency mod. Haven't seen much since the initial couple of threads on design and looking for testers. What's the consensus on these?

well, if you are going with the RT, then it will use up more air. IMO, the efficiency mod isn't worth it, especially if you can't use the L10. the only thing you could really do is have a good paint to bore match, with good single tubed barrels.